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Machunda, Revocatus L.,Lee, JongGyu,Lee, Jaeyoung John Wiley Sons, Ltd. 2010 Surface and interface analysis Vol.42 No.6
<P>We have applied zero-gap cell for gas-phase CO<SUB>2</SUB> conversion to introduce better applicability at large scale. The cathodic reduction of CO<SUB>2</SUB> has attracted considerable attention with the aim of generating useful fuels and chemicals. The CO<SUB>2</SUB> gas is reduced on the surface of the electrodeposited Pb on gas diffusion electrode to give mainly formic acid, accompanied by morphological and crystalline changes of the catalyst. These changes are revealed by both scanning electron microscope and X-ray diffraction analysis. The catalytic conversion of CO<SUB>2</SUB> gas as a function of Pb microstructures in relation to formic acid production was also investigated and is presented. Copyright © 2010 John Wiley & Sons, Ltd.</P>
Electrocatalytic reduction of CO<sub>2</sub> gas at Sn based gas diffusion electrode
Machunda, R.L.,Ju, H.,Lee, J. Elsevier 2011 Current Applied Physics Vol.11 No.4
The tin (Sn) based gas diffusion electrode was fabricated and applied for CO<SUB>2</SUB> electroreduction in a zero gap cell. The fabrication was done by electrodeposition from a simple citrate-chloride plating solution by chronoamperometric method. The electrode showed good stability during CO<SUB>2</SUB> reduction even though the conversion of CO<SUB>2</SUB> into formate reached only 18% faradaic efficiency during the initial 5 min and maintained about 12% until the end of the reduction time of 1 h.
Electrocatalytic reduction of CO_2 gas at Sn based gas diffusion electrode
Revocatus L. Machunda,주형국,이재영 한국물리학회 2011 Current Applied Physics Vol.11 No.4
The tin (Sn) based gas diffusion electrode was fabricated and applied for CO_2 electroreduction in a zero gap cell. The fabricationwas done by electrodeposition from a simple citrate―chloride plating solution by chronoamperometric method. The electrode showed good stability during CO_2 reduction even though the conversion of CO_2 into formate reached only 18% faradaic efficiency during the initial 5 min and maintained about 12% until the end of the reduction time of 1 h.
Electrocatalytic Recycling of CO<sub>2</sub>and Small Organic Molecules
Lee, Jaeyoung,Kwon, Youngkook,Machunda, Revocatus L.,Lee, Hye Jin Wiley (John WileySons) 2009 Chemistry - An Asian Journal Vol.4 No.10
<P>As global warming directly affects the ecosystems and humankind in the 21st century, attention and efforts are continuously being made to reduce the emission of greenhouse gases, especially carbon dioxide (CO2). In addition, there have been numerous efforts to electrochemically convert CO2 gas to small organic molecules (SOMs) and vice versa. Herein, we highlight recent advances made in the electrocatalytic recycling of CO2 and SOMs including (i) the overall trend of research activities made in this area, (ii) the relations between reduction conditions and products in the aqueous phase, (iii) the challenges in the use of gas diffusion electrodes for the continuous gas phase CO2 reduction, as well as (iv) the development of state of the art hybrid techniques for industrial applications. Perspectives geared to fully exploit the potential of zero-gap cells for CO2 reduction in the gaseous phase and the high applicability on a large scale are also presented. We envision that the hybrid system for CO2 reduction supported by sustainable solar, wind, and geothermal energies and waste heat will provide a long term reduction of greenhouse gas emissions and will allow for continued use of the abundant fossil fuels by industries and/or power plants but with zero emissions.</P>
Electrocatalytic Reduction of Gas-Phased CO<sub>2</sub> on Nano-Sized Sn Electrode Surface
Lee, Seunghwa,Ju, HyungKuk,Jeon, Hongrae,Machunda, Revocatus L,Kim, Dahee,Lee, Jae Kwang,Lee, Jaeyoung The Electrochemical Society 2013 ECS transactions Vol.53 No.29
<P>Electrochemical conversion of CO<SUB>2 </SUB>(ECC) is one of the promising approaches which may produce alternative organic chemicals such as HCOOH, CH<SUB>3</SUB>OH and C<SUB>2</SUB>H<SUB>4</SUB>. Use of efficient catalysts and systems are necessarily required to obtain high selectivity and high conversion rate. In this study, nano-sized Sn electrocatalyst for producing formic acid is sprayed onto the gas diffusion electrode and a zero-gap electrolytic cell with the membrane electrode assembly is applied. A constant production of formic acid analyzed by UV-spectroscopy is obtained.</P>